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Problem to eddy current response in 2D modeling

Posted 2014年1月22日 GMT-5 05:38 Low-Frequency Electromagnetics Version 4.3a 3 Replies

Liang Cheng
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I built a model in COMSOL 4.3a using AC/DC module to simulate eddy current response excited by a linear coil. A sin wave is used as excitation signal in a linear coil, and the response of eddy current density under the coil has distortion in amplitude and frequency of sin waves.

For single frequency, the response should be the same frequency as excitation. Is there any problems in my set-up? Thanks a lot!

Please find the model and signals for excitation and eddy current density attached.
3 Replies Last Post 2014年1月22日 GMT-5 09:23
Edgar J. Kaiser Certified Consultant
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Posted: 1 decade ago 2014年1月22日 GMT-5 07:40

As far as I see it is the same frequency, just with a phase shift, because there are resistive losses in the material.

Cheers
Edgar

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
As far as I see it is the same frequency, just with a phase shift, because there are resistive losses in the material. Cheers Edgar -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com
Liang Cheng
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Posted: 1 decade ago 2014年1月22日 GMT-5 08:50
So how to reduce the phase shift and amplitude attenuation?

Cheers


As far as I see it is the same frequency, just with a phase shift, because there are resistive losses in the material.

Cheers
Edgar

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com


So how to reduce the phase shift and amplitude attenuation? Cheers [QUOTE] As far as I see it is the same frequency, just with a phase shift, because there are resistive losses in the material. Cheers Edgar -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com [/QUOTE]
Edgar J. Kaiser Certified Consultant
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Posted: 1 decade ago 2014年1月22日 GMT-5 09:23

The induced current's field will always attenuate the exciting field, that's the nature of induction. Reducing losses will reduce the phase shift.
The question is, what is the purpose of the setup and why do you need to avoid the phase shift? In many applications based on eddy currents it is a desired effect bcause it provides information about the material.

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
The induced current's field will always attenuate the exciting field, that's the nature of induction. Reducing losses will reduce the phase shift. The question is, what is the purpose of the setup and why do you need to avoid the phase shift? In many applications based on eddy currents it is a desired effect bcause it provides information about the material. -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com

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